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. 2015 Feb 13;15:49. doi: 10.1186/s12885-015-1042-2

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© Binazzi et al.; licensee BioMed Central. 2015

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Forest plots of study-specific RRs and RR_pooled(95% CIs), stratified by subgroups of exposure parameters for leather dust and formaldehyde. The size of the squares reflects the statistical weight of the study in the meta-analyses.